Oily sludge is the solid being discarded or the oily sludge material. Oily sludge mainly comes from human activities in Petroleum Production and sales. In the development and utilization of oil and manufacture of petroleum products, would inevitably product oily waste. In order to achieve thermo chemistry to wash oily sludge and reclaim oil resources from oily sludge, analyzing component of landing oil sludge with Gravimetric Method, the result of analysis is necessary parameter that determine oily sludge cleaning process. The optimal mixing time, washing temperature, liquid/solid mass rate were determined based upon residual oil rate.